Time-dependent CP asymmetry in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi>B</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>K</mml:mi><mml:mo>∗</mml:mo></mml:msup><mml:mi>γ</mml:mi></mml:math> as a (quasi)null test of the Standard Model

Ball, Patricia; Zwicky, Roman

doi:10.1016/j.physletb.2006.10.013

Cited by 62 publications

(47 citation statements)

References 56 publications

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“…The radiative decays are also obvious probes of the structure of the electromagnetic operators and strategies to determine the helicity of the photon (and therefore C 7 ) with these decays have been intensively investigated [83,[93][94][95][96][97][98][99]. The inclusive b → sγ decay ratio, while theoretically clean, depends only quadratically on C 7 .…”

Section: Constraints On Right-handed Currentsmentioning

confidence: 99%

Reassessing the discovery potential of theB→K*ℓ+ℓ−decays in the

2016

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We critically examine the potential to disentangle Standard Model (SM) and New Physics (NP) in B → K * µ + µ − and B → K * e + e − decays, focusing on (i) the LHCb anomaly, (ii) the search for righthanded currents, and (iii) lepton-universality violation. Restricting ourselves to the large-recoil region, we advocate a parameterisation of the hadronic matrix elements that separates model-independent information about nonperturbative QCD from the results of model calculations. We clarify how to estimate corrections to the heavy-quark limit that would generate a right-handed (virtual) photon in the b → sγ contribution to the decay. We then apply this approach to the discussion of various sets of observables of increasing theoretical cleanness. First, we show that angular observables in the optimized P ( ) i basis are, in general, still not robust against the long-distance QCD effects, both numerically and by examining analytically the dependence on corrections to the (model-independent) heavy-quark limit. As a result, while a fit to data favours a NP contribution to the semileptonic operators of the type δC 9 −1.5, this comes at a relatively small statistical significance of 2σ, once such power corrections are properly accounted for. Second, two of these observables, P 1 and P CP 3 are particularly clean at very low q 2 and sensitive probes of right-handed quark currents. We discuss their potential to set stringent bounds on the Wilson coefficient C 7 , especially using data of the electronic mode, and we update the bounds with current angular data in the muonic channel. Finally, in light of the recent hint of lepton-universality violation in B + → K + , we introduce and investigate new lepton-universality observables involving angular observables of the muonic and electronic modes and their zero crossings, and show that, if the effect is of the size suggested by experiment, these can clearly distinguish between different NP explanations in terms of underlying semileptonic operators.

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Section: Constraints On Right-handed Currentsmentioning

confidence: 99%

Reassessing the discovery potential of theB→K*ℓ+ℓ−decays in the

2016

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“…Power-suppressed contributions also determine the time-dependent CP asymmetry in B → V γ, see Refs. [16,17,18,19], as well as isospin asymmetries [20] -all observables with a potentially large contribution from NP. The purpose of this paper is to calculate the dominant power-suppressed contributions to (1) and the resulting branching ratios and CP and isospin asymmetries, using the most up-to-date hadronic input parameters for form factors and light-cone DAs.…”

Section: Introductionmentioning

confidence: 99%

B→Vγbeyond QCD factorization

2007

Self Cite

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Abstract:We calculate the main observables in B u,d → (ρ, ω, K * )γ and B s → (K * , φ)γ decays, i.e. branching ratios and CP and isospin asymmetries. We include QCD factorisation results and also the dominant contributions beyond QCD factorisation, namely longdistance photon emission and soft-gluon emission from quark loops. All contributions beyond QCD factorisation are estimated from light-cone sum rules. We devise in particular a method for calculating soft-gluon emission, building on earlier ideas developed for analogous contributions in non-leptonic decays. Our results are relevant for new-physics searches at the B factories, the LHC and a future super-flavour factory. Using current experimental data, we also extract |V td /V ts | and the angle γ of the unitarity triangle. We give detailed tables of theoretical uncertainties of the relevant quantities which facilitates future determinations of these CKM parameters from updated experimental results.

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“…More detailed calculations, taking into account effects due to hard gluon emission, estimate the corrections at the 3-4% level [21]. The nonperturbative corrections resulted from the soft gluon emission by c-quark loop in the effective operator O 2 turn out to be about 1%, while nonperturbative contributions from the annihilation diagrams and other operators are of the same order or smaller, as was estimated in the detailed light-cone sum rule method calculations [22]. Thus the total deviation of the right to left photons ratio from zero not exceeding 5% in the SM seems to be based on rather solid theoretical grounds.…”

Section: Photon Polarization In the Standard Model And Beyondmentioning

confidence: 78%

Photon polarization in radiativeB→φKγdecay

Orlovsky

Shevchenko

2008

Phys. Rev. D

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The photon polarization in radiative decays B → Y γ is known to be a subtle probe of the effective Lagrangian structure and possible New Physics effects. We discuss exclusive decay mode B − → ϕK − γ where the experimentally distinct final state makes analysis especially promising. The possibility to extract information on the photon polarization out of the data entirely depends on the partial waves interference pattern in the ϕK − system.

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Time-dependent CP asymmetry in B→K∗γ as a (quasi)null test of the Standard Model

Cited by 62 publications

References 56 publications

Reassessing the discovery potential of theB→K*ℓ+ℓ−decays in the

Reassessing the discovery potential of theB→K*ℓ+ℓ−decays in the

B→Vγbeyond QCD factorization

Photon polarization in radiativeB→φKγdecay

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